I think the use of apostrophes for pluralization is being perpetuated lately because everyone's [everyone is] seeing it used this way so much online. Yes, there are a few exceptions where you can use them to pluralize (VERY FEW! Some abbreviations; usually just acronyms).

Apostrophes Common Usage...

1. Possession
"The kid's mother"

2. Contraction
"The kid's alright". (ie: "The kid is alright")

3. Pluralization
990 CC's (one of the rare cases ~ this is acceptable, but so is 990 CCs)

So, next time you see a hair salon with the following, "Walk In's Welcome", you know they hired a moron to do their signage.

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